#MIXLY_T_BOARD_JS_TEST.blocklyTreeRow > div.blocklyTreeRowContentContainer > span.blocklyTreeIcon {
    background: url('../media/js.svg') no-repeat;
    background-size: 100% auto;
}

#MIXLY_T_BOARD_JS_TEST.blocklyTreeRow.blocklyTreeSelected > div.blocklyTreeRowContentContainer > span.blocklyTreeIcon {
    background: url('../media/js2.svg') no-repeat;
    background-size: 100% auto;
}